Specifications

12/03/2013 Page 17 of 40
GF-2050
Benchmark Series Boilers
Venting and Combustion Application Guide
TAG-0022_0S
AERCO International, Inc. • 100 Oritani Dr. • Blauvelt, NY 10913 • Ph: 800-526-0288
A ¼-inch NPT combustion test hole is provided on each unit’s exhaust manifold connection
(See Figures 8a, 8b, 8c and 8d). A 24-inch length of straight vent is recommended downstream
of the exhaust manifold, as illustrated in these figures.
The vent system should always be pitched up ¼ inch per foot of run towards the vent
termination to enable condensate to drain back to the unit for disposal. Low spots in the vent
must be avoided. Periodic inspection should be performed to assure correct drainage.
Benchmark vents should not be interconnected to those of other manufacturers' equipment.
Horizontal vent and ductwork should be supported to prevent sagging, in accordance with local
code and the vent manufacturer’s requirements. Vertical vent and ductwork should be
supported to prevent excessive stress on the horizontal runs. The exhaust manifold and inlet air
adapter should never be used as weight-supporting elements. The supports should be so
arranged and the overall layout designed to assure that stresses on the vent and combustion air
connections are minimized.
The vents and combustion air ducts may be insulated in accordance with the vent
manufacturer's instructions and local codes.
Figure 8a: Ducted Combustion Connection for BMK 750 & BMK 1000 Boilers
AIR INLET
6” DIAMETER
MINIMUM